[单项选择]一般人的听觉对下列哪一范围的频率接收性最强？（）
A. 400至800赫兹
B. 4000至8000赫兹
C. 40000至80000赫兹

案情:甲在2003午10月15日见路边一辆面包车没有上锁，即将车开走，前往A市。行驶途中，行人乙拦车要求搭乘，甲同意。甲见乙提包内有巨额现金，遂起意图财。行驶到某偏僻处时，甲谎称发生故障，请乙下车帮助推车。乙将手提包放在面包车座位上，然后下车。甲乘机发动面包车欲逃。乙察觉出甲的意图后，紧抓住车门不放，被面包车拖行10余米。甲见乙仍不松手并跟着车跑，便加速疾驶，使乙摔倒在地，造成重伤。乙报警后，公安机关根据汽车号牌将甲查获。
讯问过程中，虽有乙的指认并查获赃物，但甲拒不交待。侦查人员丙、 在这种情况下丁对此十分气愤，对甲进行殴打，造成甲轻伤 甲供述了以上犯罪事实，同时还交待了其在B市所犯的以下罪行:2003年6月的一天，甲于某小学放学之际，在校门前拦截了一名一年级男生，将其骗走，随即带该男生到某个体商店，向商店老板购买价值5000余元的高档烟酒。在交款时，甲声称未带够钱，将男生留在商店，回去拿钱交款后再将男生带走。商店老板以为男生是甲的儿子便同意了。甲携带烟酒逃之夭夭，公安机关查明，甲身边确有若干与甲骗来的烟酒名称相同的烟酒，但未能查找到商店老板和男生。
本案移送检察机关审查起诉后，甲称其认罪口供均系侦查人员丙、丁对他刑讯逼供所致，推翻了以前所有的有罪供述。经检察人员调查核实，确认了侦查人员丙、丁对甲刑讯逼供的事实。

Passage Five
Many animals are used to help scientists find cures for diseases. One of the most common animals used is monkeys, or primates. There are groups of people who want to stop the research on animals. They are called animal rights activists.
The scientists say their research could help save the lives of many men, women and children. They try to cure diseases like cancer and AIDS.
The animal rights activists say the animals suffer. They take baby monkeys away from their mothers, and sometimes holes are drilled in their heads. The activists have tried to stop the research for the past 10 years. They let animals go free or damage the labs.
The University of California at Davis has 3,800 rhesus macaque monkeys. It is one of the largest primate research labs. The activists sent letters to researchers at Davis and about eighty other researchers around the country, whose names were on the web pages. The warning letters had razor blades hidd
A. The activist will release all the animals.
B. The activists will use violence against the researchers.
C. The activist will commit vivisection.
D. In the autumn of 2000, the activists will send more letters.